Feangois coignet



UNITED STATES PATENT OFFICE.

FEANcoIs'ComEET, 0F PARIS, FRANCE, ASSIGNOR T0 L. MANGEON, 0F

" NEW YORK CITY.

IMPROVED MODE OP TREATING AND MANIPULATING CEMENTS IN THE MANUFACTURE OFARTIFICIAL STONE.

Specification forming part of Letters Patent No. 88,548, dated April 6,1869.

To all whom it may concern:

Be it known that I, F. OOIGNET, of the city of Paris, in the Departmentof La Seine and Empire of France, have invented certain new and usefulImprovements in the Manufacture of Artificial Stones; and I do herebydeclare that the following is a full and exact description thereof,which will enable any one skilled in the art to make and use the saidinvention.

In the ordinary way of employing hydraulic cements a large quantity ofwater is used, so as to obtain a thin mortar having the consistence ofcream. This mortar is always used at once, and it is indicated by allgood practical authors asa great blunder to let the cementmortar setbefore you use it.

In my process, in order to obtain artificial stones of the greatesttenuity and hardness, I proceedthus: I introduce the h 'draulic cementin a dry state into a proper mill, and when it ifisfin motion Iintroduce iu st ppn b water to and y prolonged and in the proportion offrom two to four parts,

according to the object for which it is to be employed, and it is againpassed through the mill at third and even a fourth time, if necessary.It comes out of the mill in the proper state of plastic powder or shortpaste, and in that state is one of the best artificial stonepastes thatcan be obtained, which, by proper.

f ten hene m pls ,9 energetic matron I obtain a thick plastic hydrauliccement and sand prepared and ag- Tast 1s plasticpaste is now mixed withglomerated, substantially in the manner herein I from two to three partsin bulk of good, sharp, fine sand and the mixture is again returned tothe mill, whereit is again energetically triturated. As it comes out ofthe mill it is specified.

FRANQOIS OOIGNET.

Witnesses I EMILE BARBAULT,

L. OLMART, v Both of 17 Bouleoard St. Martin".

